peritreme of thoracic spiracle [FBbt_00013121]

The two-lipped external rim of an adult thoracic spiracle. Contraction of the spiracular occlusor muscle (FBbt:00013335) brings the two lips together, closing the spiracle.

peritreme of thoracic spiracle

ID: FBbt_00013121

Adult Anatomy

The two-lipped external rim of an adult thoracic spiracle. Contraction of the spiracular occlusor muscle (FBbt:00013335) brings the two lips together, closing the spiracle.

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## Classification

Relationships